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Diffstat (limited to 'src/gui/text/freetype/qfontengine_ft_p.h')
| -rw-r--r-- | src/gui/text/freetype/qfontengine_ft_p.h | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/src/gui/text/freetype/qfontengine_ft_p.h b/src/gui/text/freetype/qfontengine_ft_p.h new file mode 100644 index 0000000000..bdd4549827 --- /dev/null +++ b/src/gui/text/freetype/qfontengine_ft_p.h @@ -0,0 +1,354 @@ +// Copyright (C) 2021 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only +#ifndef QFONTENGINE_FT_P_H +#define QFONTENGINE_FT_P_H +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include "private/qfontengine_p.h" + +#ifndef QT_NO_FREETYPE + +#include <ft2build.h> +#include FT_FREETYPE_H +#include FT_MULTIPLE_MASTERS_H + + +#ifndef Q_OS_WIN +#include <unistd.h> +#endif + +#include <qmutex.h> + +#include <string.h> + +QT_BEGIN_NAMESPACE + +class QFontEngineFTRawFont; +class QFontconfigDatabase; + +/* + * This class represents one font file on disk (like Arial.ttf) and is shared between all the font engines + * that show this font file (at different pixel sizes). + */ +class Q_GUI_EXPORT QFreetypeFace +{ +public: + void computeSize(const QFontDef &fontDef, int *xsize, int *ysize, bool *outline_drawing, QFixed *scalableBitmapScaleFactor); + QFontEngine::Properties properties() const; + bool getSfntTable(uint tag, uchar *buffer, uint *length) const; + + static QFreetypeFace *getFace(const QFontEngine::FaceId &face_id, + const QByteArray &fontData = QByteArray()); + void release(const QFontEngine::FaceId &face_id); + + static int getFaceIndexByStyleName(const QString &faceFileName, const QString &styleName); + + // locks the struct for usage. Any read/write operations require locking. + void lock() + { + _lock.lock(); + } + void unlock() + { + _lock.unlock(); + } + + FT_Face face; + FT_MM_Var *mm_var; + int xsize; // 26.6 + int ysize; // 26.6 + FT_Matrix matrix; + FT_CharMap unicode_map; + FT_CharMap symbol_map; + + enum { cmapCacheSize = 0x200 }; + glyph_t cmapCache[cmapCacheSize]; + + int fsType() const; + + int getPointInOutline(glyph_t glyph, int flags, quint32 point, QFixed *xpos, QFixed *ypos, quint32 *nPoints); + + bool isScalable() const; + bool isScalableBitmap() const; + + static void addGlyphToPath(FT_Face face, FT_GlyphSlot g, const QFixedPoint &point, QPainterPath *path, FT_Fixed x_scale, FT_Fixed y_scale); + static void addBitmapToPath(FT_GlyphSlot slot, const QFixedPoint &point, QPainterPath *path); + +private: + friend class QFontEngineFT; + friend class QtFreetypeData; + QFreetypeFace() = default; + ~QFreetypeFace() {} + void cleanup(); + QAtomicInt ref; + QRecursiveMutex _lock; + QByteArray fontData; + + QFontEngine::Holder hbFace; +}; + +class Q_GUI_EXPORT QFontEngineFT : public QFontEngine +{ +public: + struct GlyphInfo { + int linearAdvance; + unsigned short width; + unsigned short height; + short x; + short y; + short xOff; + short yOff; + }; + + struct GlyphAndSubPixelPosition + { + GlyphAndSubPixelPosition(glyph_t g, const QFixedPoint spp) : glyph(g), subPixelPosition(spp) {} + + bool operator==(const GlyphAndSubPixelPosition &other) const + { + return glyph == other.glyph && subPixelPosition == other.subPixelPosition; + } + + glyph_t glyph; + QFixedPoint subPixelPosition; + }; + + struct QGlyphSet + { + QGlyphSet(); + ~QGlyphSet(); + FT_Matrix transformationMatrix; + bool outline_drawing; + + void removeGlyphFromCache(glyph_t index, const QFixedPoint &subPixelPosition); + void clear(); + inline bool useFastGlyphData(glyph_t index, const QFixedPoint &subPixelPosition) const { + return (index < 256 && subPixelPosition.x == 0 && subPixelPosition.y == 0); + } + inline Glyph *getGlyph(glyph_t index, + const QFixedPoint &subPixelPositionX = QFixedPoint()) const; + void setGlyph(glyph_t index, const QFixedPoint &spp, Glyph *glyph); + + inline bool isGlyphMissing(glyph_t index) const { return missing_glyphs.contains(index); } + inline void setGlyphMissing(glyph_t index) const { missing_glyphs.insert(index); } +private: + Q_DISABLE_COPY(QGlyphSet); + mutable QHash<GlyphAndSubPixelPosition, Glyph *> glyph_data; // maps from glyph index to glyph data + mutable QSet<glyph_t> missing_glyphs; + mutable Glyph *fast_glyph_data[256]; // for fast lookup of glyphs < 256 + mutable int fast_glyph_count; + }; + + QFontEngine::FaceId faceId() const override; + QFontEngine::Properties properties() const override; + QFixed emSquareSize() const override; + bool supportsHorizontalSubPixelPositions() const override + { + return default_hint_style == HintLight || + default_hint_style == HintNone; + } + + bool supportsVerticalSubPixelPositions() const override + { + return supportsHorizontalSubPixelPositions(); + } + + bool getSfntTableData(uint tag, uchar *buffer, uint *length) const override; + int synthesized() const override; + + void initializeHeightMetrics() const override; + QFixed capHeight() const override; + QFixed xHeight() const override; + QFixed averageCharWidth() const override; + + qreal maxCharWidth() const override; + QFixed lineThickness() const override; + QFixed underlinePosition() const override; + + glyph_t glyphIndex(uint ucs4) const override; + void doKerning(QGlyphLayout *, ShaperFlags) const override; + + void getUnscaledGlyph(glyph_t glyph, QPainterPath *path, glyph_metrics_t *metrics) override; + + bool supportsTransformation(const QTransform &transform) const override; + + void addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nglyphs, + QPainterPath *path, QTextItem::RenderFlags flags) override; + void addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, + QPainterPath *path, QTextItem::RenderFlags flags) override; + + int stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, ShaperFlags flags) const override; + + glyph_metrics_t boundingBox(const QGlyphLayout &glyphs) override; + glyph_metrics_t boundingBox(glyph_t glyph) override; + glyph_metrics_t boundingBox(glyph_t glyph, const QTransform &matrix) override; + + void recalcAdvances(QGlyphLayout *glyphs, ShaperFlags flags) const override; + QImage alphaMapForGlyph(glyph_t g) override { return alphaMapForGlyph(g, QFixedPoint()); } + QImage alphaMapForGlyph(glyph_t, const QFixedPoint &) override; + QImage alphaMapForGlyph(glyph_t glyph, const QFixedPoint &subPixelPosition, const QTransform &t) override; + QImage alphaRGBMapForGlyph(glyph_t, const QFixedPoint &subPixelPosition, const QTransform &t) override; + QImage bitmapForGlyph(glyph_t, const QFixedPoint &subPixelPosition, const QTransform &t, const QColor &color) override; + glyph_metrics_t alphaMapBoundingBox(glyph_t glyph, + const QFixedPoint &subPixelPosition, + const QTransform &matrix, + QFontEngine::GlyphFormat format) override; + Glyph *glyphData(glyph_t glyph, + const QFixedPoint &subPixelPosition, + GlyphFormat neededFormat, + const QTransform &t) override; + bool hasInternalCaching() const override { return cacheEnabled; } + bool expectsGammaCorrectedBlending() const override; + + void removeGlyphFromCache(glyph_t glyph) override; + int glyphMargin(QFontEngine::GlyphFormat /* format */) override { return 0; } + + int glyphCount() const override; + + enum Scaling { + Scaled, + Unscaled + }; + FT_Face lockFace(Scaling scale = Scaled) const; + void unlockFace() const; + + FT_Face non_locked_face() const; + + inline bool drawAntialiased() const { return antialias; } + inline bool invalid() const { return xsize == 0 && ysize == 0; } + inline bool isBitmapFont() const { return defaultFormat == Format_Mono; } + inline bool isScalableBitmap() const { return freetype->isScalableBitmap(); } + + inline Glyph *loadGlyph(uint glyph, + const QFixedPoint &subPixelPosition, + GlyphFormat format = Format_None, + bool fetchMetricsOnly = false, + bool disableOutlineDrawing = false) const + { return loadGlyph(cacheEnabled ? &defaultGlyphSet : nullptr, glyph, subPixelPosition, format, fetchMetricsOnly, disableOutlineDrawing); } + Glyph *loadGlyph(QGlyphSet *set, + uint glyph, + const QFixedPoint &subPixelPosition, + GlyphFormat = Format_None, + bool fetchMetricsOnly = false, + bool disableOutlineDrawing = false) const; + Glyph *loadGlyphFor(glyph_t g, + const QFixedPoint &subPixelPosition, + GlyphFormat format, + const QTransform &t, + bool fetchBoundingBox = false, + bool disableOutlineDrawing = false); + + QGlyphSet *loadGlyphSet(const QTransform &matrix); + + QFontEngineFT(const QFontDef &fd); + virtual ~QFontEngineFT(); + + bool init(FaceId faceId, bool antiaalias, GlyphFormat defaultFormat = Format_None, + const QByteArray &fontData = QByteArray()); + bool init(FaceId faceId, bool antialias, GlyphFormat format, + QFreetypeFace *freetypeFace); + + int getPointInOutline(glyph_t glyph, int flags, quint32 point, QFixed *xpos, QFixed *ypos, quint32 *nPoints) override; + + void setQtDefaultHintStyle(QFont::HintingPreference hintingPreference); + void setDefaultHintStyle(HintStyle style) override; + + QFontEngine *cloneWithSize(qreal pixelSize) const override; + Qt::HANDLE handle() const override; + bool initFromFontEngine(const QFontEngineFT *fontEngine); + + HintStyle defaultHintStyle() const { return default_hint_style; } + + static QFontEngineFT *create(const QFontDef &fontDef, FaceId faceId, const QByteArray &fontData = QByteArray()); + static QFontEngineFT *create(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference, const QMap<QFont::Tag, float> &variableAxisValue); + +protected: + + QFreetypeFace *freetype; + mutable int default_load_flags; + HintStyle default_hint_style; + bool antialias; + bool transform; + bool embolden; + bool obliquen; + SubpixelAntialiasingType subpixelType; + int lcdFilterType; + bool embeddedbitmap; + bool cacheEnabled; + bool forceAutoHint; + bool stemDarkeningDriver; + +private: + friend class QFontEngineFTRawFont; + friend class QFontconfigDatabase; + friend class QFreeTypeFontDatabase; + friend class QFontEngineMultiFontConfig; + + int loadFlags(QGlyphSet *set, GlyphFormat format, int flags, bool &hsubpixel, int &vfactor) const; + bool shouldUseDesignMetrics(ShaperFlags flags) const; + QFixed scaledBitmapMetrics(QFixed m) const; + glyph_metrics_t scaledBitmapMetrics(const glyph_metrics_t &m, const QTransform &matrix) const; + + GlyphFormat defaultFormat; + FT_Matrix matrix; + + struct TransformedGlyphSets { + enum { nSets = 10 }; + QGlyphSet *sets[nSets]; + + QGlyphSet *findSet(const QTransform &matrix, const QFontDef &fontDef); + TransformedGlyphSets() { std::fill(&sets[0], &sets[nSets], nullptr); } + ~TransformedGlyphSets() { qDeleteAll(&sets[0], &sets[nSets]); } + private: + void moveToFront(int i); + Q_DISABLE_COPY(TransformedGlyphSets); + }; + TransformedGlyphSets transformedGlyphSets; + mutable QGlyphSet defaultGlyphSet; + + QFontEngine::FaceId face_id; + + int xsize; + int ysize; + + QFixed line_thickness; + QFixed underline_position; + + FT_Size_Metrics metrics; + mutable bool kerning_pairs_loaded; + QFixed scalableBitmapScaleFactor; +}; + + +inline size_t qHash(const QFontEngineFT::GlyphAndSubPixelPosition &g, size_t seed = 0) +{ + return qHashMulti(seed, + g.glyph, + g.subPixelPosition.x.value(), + g.subPixelPosition.y.value()); +} + +inline QFontEngineFT::Glyph *QFontEngineFT::QGlyphSet::getGlyph(glyph_t index, + const QFixedPoint &subPixelPosition) const +{ + if (useFastGlyphData(index, subPixelPosition)) + return fast_glyph_data[index]; + return glyph_data.value(GlyphAndSubPixelPosition(index, subPixelPosition)); +} + +Q_GUI_EXPORT FT_Library qt_getFreetype(); + +QT_END_NAMESPACE + +#endif // QT_NO_FREETYPE + +#endif // QFONTENGINE_FT_P_H |